boissieb



(No Model.)

H. R. BOISSIER.

BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES.

' Patented Jan. 13,1885L INVENTOR ATTORNEY BY I WITNESSES i w UNITEDSTATES PATENT Urricn.

HERRMANN R. BOISSIER, OF NEW YORK, N. Y.

BRUSH-HOLDER FOR DYNAMO-ELECTFHC MACHINES.

SPECIPICATIONforming part of Letters Patent No. 310,780, dated January13, 1885.

Application filed May 13, 1882.

(No model.) Patented in England January 2.2, 1

83, No.35'/; in France January 22,1883,No.153,253;

S in Belgium January 22, 1883, No. 60,233; in Germany January 24, 1883,No. 2 95; and in Austria August 7, 1883, No. 4,289.

To all whom it may concern.-

Be it known that I, HERRMANN It. BOISSIER, of New York, in the county ofNew York and State of New York, have invented a new and usefulImprovement in Dynamo or Magneto Electric Machines; and I do herebydeclare that the following is a full and exact description of the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon.

My invention relates to the commutatorbrush holders of dynamo andmagneto electric machines; and its objectis to provide a brush-holder ofsuch construction that the brush may be readily adjusted therein, andyet be held firmly and securely in the desired position, and to soprotect the clamping devices and the brush that they may be handledwithout danger of accidental shocks, to which ends it consists in thefeatures more particularly hereinafter described and claimed.

In carrying the invention into effect the brushholder is made as a framewith open sides, within which afollower is arranged to travel, it beingadapted to press and hold the brush upon the bottom of the frame. Uponthe sides of the follower two projections rise, in which are pivoted arod carrying a cam or eccentric shaped on its two sides and lower end asa parallelogram, while the upper end is formed into acurve, such as theone shown, or a similar one. Upon the under side of the upper part ofthe brush-holder is a spring. The rod upon which the eccentric ismounted is prolonged beyond the carrier, and terminates in a knob,preferably rubber-coated or otherwise insulated. \Vhen this rod isturned so that the longer sides of the eccentric are parallel to thebrush, the follower is so loosened that the brush may be freely movedtherein. When it is adjusted, a quarter-turn of the rod brings theeccentric so that its upper curved end presses'against the spring aboveit, and by means of the rod passing through the ears attached to thefollower it presses the latter down upon the brush, holding it securely,the upper end taking against the spring, which, fitting slightly intothe curve mentioned, holds the eccentric against accidentaldisplacement. The outer end of the brush, which is preferably composedof several strips or wires, is covered with rubber or other goodinsulator, so that it may be handled without danger of shock. Such anarrangementis shown in the drawings, wherein-- Figure 1 is a side, andFig. 2 a top, view of a brush holder embodying the invention. Figs. 3and a are end views showing the eccentric in different positions, andFig. 5 a view showing the preferred form of the eccentrio.

0 is the frame of the brush-holder,provided with a projection or lug, L,for attachment to the machine. The frame 0 is composed of a bottom, a,sides 0 a, and top I). IVithin the rectangular opening thus formed playsthe fol lower D, upon the sides of which lugs (Z are formed, furnishinga support and pivots for the rod A, which is prolonged and terminated inthe rubber or insulated knob B. Upon this rod, and between the supports(2 d, is secured the cam 6, formed with two long parallel sides and abase at right angles thereto, while the top is formed as a curve havingtwo slightlyelevated curves, 50 00, with a concavity, y, between them;Upon the under part of the top I) of the brush-frame is secured thespring 1'. hen the rod A is turned so that the eccentrio is in theposition shown in Fig. 3, the follower is released, so that the brush Hmay be inserted or moved to any desired position between D and a. XVhenH is adjusted,the rod A is given a one-fourth turn, which brings 6 intothe position shown in Fig. 4, the upper part taking against the spring,the pressure being transmitted to the follower, which grips the brush Hby means of the pivots formed by the rod A passing through the cam andears of follower. The bottom of the cam clears the top of the follower,so as not to interfere with its action. From the shape of the top thespring bears upon a; x, and holds it positively and firmly againstaccidental displacement. The free end of the brush H is covered withrubber or other good insulator, I. The rod A being protected at its endby the knob B and the brush by its coating 1, all danger of shock whileadjusting or changing the brush is avoided.

The devices described enable the brush to be \V hat I claim isl. Ahrnsh-holder for adynamo or magneto electric machine, consisting of aframe, a follower sliding therein, and an eccentric or cam for operatingthe follower, snbzistantially as set forth.

2. A hrnsl1-holder for a dynamo or magneto electric machine, consistingof a frame, a follower canahle of sliding therein, and an cecentric orcam for operating the follower, mounted upon a rod having its bcaringsinlugs upon the follower, substantially as set forth.

In a dynamo or magneto electric machine, the combination of an eccentrichaving its top composed of three curves, the middle one being concave,as shown, with a spring adapted to take in snch curve and hold the samein position with the frame and follower of a ln'nshholder, allsubstantially as shown and set forth.

This specification signed and witnessed this 9th day of May, 1882.

HERRBMEN R. BO'ISSIER. Ysitnesses:

H. V7. SEELY, ll. 13. Yi innnn.

